dftemel



A. J. DREMEL Feb. 26, 1929.

' LAWN MOWER Filed April 5. 192

5 Sheets-Sheet \Q Hv Iv .m m M 3 4 N w M M r m mi M uh hnu V 1 h ob $0 uu Y i B a 7 NHL 4 Wm N 6 v M A TTORNEYS.

Feb. 26, 1929.

A. J. DREMEL LAWN MOWER Filed April 5 1922 5 Sheets-Sheet 2 INVENTOR. BY(7 6 t MR-Kkg mm ATTORNEYS- Feb. 26, 1929. 1,703,521

A. J. DREMEL LAWN MOWER Filed April 5. 1922 5 Sheets-Sheet 3 Z5 25 2 mNV II II MIJLHJLJLJQ I N VEN TOR.

YWOLM ATTORNEYS? Feb. 26, 1929. 1,703,521

A; J. DREMEL LAWN MOWER Filed April 5, 1922 5 Sheets-Sheet 4 INVENTOR.

ATTORNEYS.

A. J. DREMEL LAWN MOWER Filed April 5, 1922 5 Sheets-Sheet INVENTOR.

w 3 NT mm m:

. 9m g g ATTORNEYJ'.

FIC i.

ALBERT d. DREIEEL, OF RACINE, WISCONSIN.

v LAK /"N I-ZIOWER.

Application sled April 5,

This inwn ion 1- i nrowe the object of the i construction and in theniainier to be claimed.

Referring to the drawings which accompany this specification andliOl'll'l a part here i V 1 oi, which drawings illustrate an embodimentof this invention, and on i Inch drawings the same reference charactersare employed to desio wl'ler Ver they may l is a Fi 1 the direction benomitted brolien awe lig. is a 1 J V J 7 pa rts of the lawn rnower, themien on the line on .e direction indicated by the ore being drawn on anenlarg d scale; and Fig. 6 is a section, on an en larged scale throughparts of the lawn mower, the plane of the section being ind1-- cated bythe line (3 4% on Fig. 41- he section e'n; viewed looking in thedirection indicated by the arrows.

, read il understood.

"1922. Serial No. 549,783.

The motor 1 as illusinted, is provided with an exhaust 16, innflier l'i,a, magneto 18, a fuel or gasoline tank 19, all shown by the drawingsant. which may be of any suitable or preferred construction, and fuelconnection, carburetor, sparkplug, and lubricating mechanism ano acce.series which, being well-known, are not illustrated by the. drawings forthe sake of sin1- plicity of illustration. The specific motorillustrated by the drawings is of the two-cycle type but thisinventioi'i is not confined to any specific type or cha acteristic ofmotor. The men r 1' is located, as a matter of preference, in the rearof the axis of rotation of the ground-wheels 2 and 3, and the frame isprovided with rearcxtensions 20 and 21 to which are adjnstebly securedroller-arms 22 and 23. A shaft 2+5 is secured to the rollerarms 22 and28 and has a plurality oi rollers 25 separately mounted thereon. Asingle roller of any considerable length would tend to scrape the grassand ground, by reason of what is known at slip when the lawn mower isbeing); turned, and a single short roller is not d sir-able to: thereason that the roller, besides aliording a stable equilibrium andassisting in supporting the lawn mower, is actually relied upon for its1' )lling elieet in compacting, evening and solidifying the ground whereit has been slightly displaced by earth-worms, ttor trample. T hefiYQ-il- Referring); to the drawings, the reference knife or cutter-bar2b is secured to a lower numeral 1 dos-donates a motor whici isillnscross-member of the iraine and, by ad usting: trated by the draw san internal comthe inner-arms 22 and 23, which nvolves bustion motor ori which is ultimately the simultaneous movement or the strait supnortedb around-wheels and an; ant the rollers 2'", not i respectto the rearllI I p which 1S a c direction nroror as distn extensions 20 and 21., thehe ght oi the listednuished tron reversible motor or eng'nie. lUUTi'Q orcutter-bar 26 can be varied and the i In the construction illustrated bythe inns, the motor 1 is immediately supported b? a base which also theupper cross-- nieinber ol? a Ltranie to which the groundwhoels 2 and 2}are connected in the manner to he hereina described. 'llhe crlindcr 5 otthe motor illustrated as prox. head-.- i. lial in lies 6 and the (wholialllv surrounded by an air-jacket 'lhe ilvmieels it? 1 in, ded

i I 8 and eir arms am; through the fanand i) and the air-jacket '4",over the 5 and the heat-rediatir cool the c linder in a manner height ofthe to be let standing can accurately predetermined. The 121l'-3X-tensions 21, and the roller-arms 22 and rarrying the shaft- 2l and'therollers can then be in d 1nto other positions of adustrnent; the *ationscan then be engaged LCl the nuts 31 and 32 tlghtene l. The wheelase soto speak, of the lawn n ower can also be altered by the same mechanism,as the rolle arms 22 and 28 can be rotated about I the bolts 29 and 30through a complete arc of 180 degrees so that the rollers 25 be V 2 ofthe'drawin 42 has a, hearing against the end in. mi

ground-wheels 2 and 3, as clearly shown by the full-l1ue and thedotted-l1ne positions ot 1e ro rs .45 r .J .1 1r: wi, as. For tl lle byFi 9 )l H or i n cutting on ground that [S ijzurly level,

or o'if fairly even surface without reg-art to level, the longerwheel-base as shown hy the full-line position of the rollers on Fig.

o, lSPEGliCll'Cfl on account of the greater stability or equilihriui'nof the lawn. mower and the more evenly cut surface, or nap, ot the grasswhile on rougher ground, the shorter wheel-base, as shown by thedotted-line position of the rollers, is preferred. to avoid thepossibility e, the reel knives and the CUlZiTGT-b8T 26 contacting; with,or digging into, the ground.

The crank-shaft '12 has a pinion 83 keyed, or otherwise suitably securedthereto, and this pinion meshes with a gear 84.

meshes with the gear which drives the reel-shaft- 36 through a ifri-cluteh mebhauism to. be herein? er died. It will be readily seen that,with the construction thus for deserihed, the rotation of thecrank-shattby the 'l notor 1 will rotate the reel-shaft 3e and theread-knives or cuters 37 secured'thereto. The 34 also rotates or drivesthe ground-wheels 2 and 3 by means of the following mechanism.Referring, now, especially to Fig. 5 of the drawings, the referencenumeral designates anend member of the frame to which a gear-cover 39 issecured, and the crank-shaft 1.2 is jonrnaled in the end. member l r thesir-cover 39. The end member 38 of the frame is hored to receive atubular hushing 40 which u'iav be pressed into the bore 41 or securedtherein in any suitable manner to hold it rigid. and stationary to serveas a fixed stud or shaft. A spider 42 provided with a tubular huh 43 isroietahly mounted on the tubular bushing and the eer 34 is retatehlymounted on the tulnilar hub 43 of the spider 42. The huh 44 of the gear34 is slightly shorterthen the tul hub 43 of the spider 462K131 which itis mounted, so as to provide for ahsolute treedon'i oi rotational ninward]y-inereusing-tapered will l.

movemmit. p irietion-ringr is secured by screws 4'6, :ior example,within the rim 4? of the gear 34. A iriet ii-eup 48 is assemb ed withinthe .t 'ictioirring 45, and the tion-surtuccs oi. the i'rieiion cup ed'the fruition-ring 44 are held in eontact when springs 49 fierce thefrictiorhcup 48 outwardly from the spidcrtll. it will be readilyunderstood that this constructionis a friction-clutch n'iechanism and,from an inspection o't tho drawings, it will be observed that thetubular huh 41.3 of the spider 1: 38 of the frame. The spider and thefrictioncup 48 are locked together apuinst rele- Vtive rotationalmovement without prevent- The of the 11318 undprojeots through iuggrelative longitudinal movement in any suitable manner as, for example,by a iin 50 on the spider en niging within a recess 51 proi'ded in thefriction-cup 48. A clutchinen'iher 522, provided with clutoh-teeth 53,is connected with the friction-cup 48 to clutch the friction-cup 48 tothe pinion 54. The construction illustrated by the drawings is asfollows. The clutch-member 52 is mounted for rotst. on the tubularbushing 40 and ms projec a which engage in slots 56 in the friction-cup48. Another tubular bushing 37 li e over the outer end of the tubularbushing 40 and beers againstthe clutchmember 52. The pinion end afacing} cl ch-memher 58 are rotatably mounted on the tubular bushing 5".and are held together by being located between a part of the gearcmer 39and a geur-housin 59 secured to. the

ided i eeth 61 to. en, with the (hitch-teeth 53 the cluttnieinloer 52.The clutch-teeth L, and the clutch-teeth 61 could he formed directly onthe friction-cup 48' end the pinion 54, respectively, having regard onlyto function .and operation, and the mechsi-iical reason for the use ofthe separate chitch-memher 55-3 end member 58, in the constructionillustrated and described, so that the clutch-teeth may be termed otsteel, or other suitable hard motel, while the friotion-eup 48 and thepinion M can he formed of cost-ironto minimize e: pense. A clutch-rod 62e1 tends into the irhula bushing 40. and has it flanged he l 63 securedthereto hy a 1 'n 64. 1 The is k e is of greater diemetei than the hereof the tubular bushin 5? d, when the cluteh-rod pulled inwardly, thetubular bushing 57 will he foreed inwardly and will force theclutclvmemher J2 and the friction-cup 48 in- V iterentizil-geurmechanism. The round-wheel 2 isloose on the shaft (37 and has a tubular.hub (38 and is provided with av hovel-gear 69 for engaging withhevehpinionz: 0 which are mounted on the master-gear 66. The nuistengear 66 is joi'u-naled upon the tubular huh ot the grouncl-wheel 2 andis free to rotate thereon. A bevel-gear 71 also meshes-with thel;)evel-pinions Ti) ind is secured to the shatt- 67 by the key 72 A toprevent any relative movement of the hovel-gear 71 with respect to theshaft 67. A cap 74 and a pin 75heep the ground-wheel 2 inposition on theshaft 67 with the bevel.- pinions 70 in proper mesh with the bevel thetaciiigclutch end the pin 72:1,tor e, ample gears 69 and 71. Theground-wheel 3 and a collar '76 are lzeyed, by a key 77, to the otherend of the shaft 67 and are retained on the shaft by a esp 78 ands. pin79. The ground- Wheel 8 has a tubular hub 80 on which s gear 81 isslidably mounted. The r cer 81 has a short rod 82 secured thereto whichprojects on opposite sides thereof so that the gee tr 81 can be moved tosuch a position that the short rod 82 will only engage with the groundwheel 3 by passing through hole 9t therein, or can be moved to such aposition that the short rod 82 will only gage with collar 76 by passingthrough a. hole 85 therein. The short rod 82 is a clutch mechanism forclutching the gear 81 to the collar 76 and the shaft 67, when the gear81 moved into mesh with the gear 83, end for holding the gear 81positively out of mesh, or possibility of meshing, with gear 83. Thegear 81 is moved, upon the hub of the groundwheel 3, away from theground-wheel 3 to enit with, or inesh it, with, the gear 853, and movedtowards the groundevhe disthe -31 engage it from, or out of ll'PSllwith, the gear 83, as will be readily understood from an inspection ofFig. 6 of the i'lrswings. The gear .3 is secured to the reel-shalt 36,to rotate the same, in a manner to be hereinafter described. The shortrod, or clutch member, 82 is provided with holes 86 and 87 near its endsthrough which a cotter-pin 88 be inserted either outside of theground-wheel. 3 or inside the collar 76 to hole the gear 81 in its twopredetermined positions.

It will be readily understood that the diilerential-gear mechanismpermits the ground-wheels 2 and 3 to be rotated at different whenturning the lawn mower, so that the sod will not be damaged.

The reel-shaft 36 is rotatably mounted in bearings 89 and 90 and is alsotree to be moved longitudinally in said bearings. The beerings 89 and 90ere illustrat d by the drawingjs as bnshin s located in bores in bosseswhich extend inwardly from the end members, or framestandards, ot theframe. A bushing 91, provided with a flange 92 and a tubular hub 93, ismounted on a cylimilricsl, part of the rec ash-(1ft 3G and is surr -d byii. cylindrical. tubular, ant-ii-it'riction bushing 9 and the gear 35 isrotatably nicu ted on the anti-'lriction bushii 9- c gi'czir h as 2!irictionwing secured t" Uv by screws 90, tor OXtZilPle. and the interioroi the i'ric ion-ring, which is conical, is oi larger d. ctcr at itsinner end than at its 0 An end of the rec hatt 36 is made oinil contour,squa' for 0x911111 1, ii shoulder 97, the squared part or" the inn,-designated by the reference Ill1l1131l 98. A friction-cup 99, with asquared aperture 100, is assembled upon the squared part 98 thereelshali't 36 and isreteined thereon. by e. bolt101 which screws into ascrewthreaded hole in the end of the reel-shatt 36 and which is providedwith a polygonal-shaped head 102 to receive a wrench. A. spring); 105bears against the friction-cup 99 at one end and against the bushing 91at its other end and tents to move the reel-shaft 36, and partsconnected thereto, to the right, looking}; at Fig. 6 of the drawings,but to the let't when looking at Figs. 1, 3 and 5 ot the drawingsto keepthe triction-cup 99 engaged with the friction-ring 95, except whendisengsgr therefrom in the manner to be hereinat't-r described. Thefriction-cup 99 is provided with a recess 10%- into which extends an arm105 on the bushing 91, so that the friction-cup 99 and the bushing 91will be compelled to rotate together while permitting the frictioncup 99to be moved longitudinally with respect to the bushing 91. Thisconstruction locks the 35, the friction-cup 99, and the bushing 91 tothe reel-shaft 86, to rotate therewith and reduce friction when thetrictioncup 99 is engaged with the frictioirrinp; and to permit the gear35 to be rotated with very little friction on the bushing 9t when thefriction-cup 99 is disengaged from the friction-ring;

To provide for the easy removal and replacement of the gear 83, it isbored to over the reelshatt 36 end the reel-shaft is provided with ahole for a pin 106 which ongages in a slot 107 in the hub of the gear88, the gear itself bein recessed so as to overlie the pin 106, asclearly shown by his 6 of the drawings. The gear 83 can be Slit) ed overthe end of the reel-shaft 36, the pin inserted in its hole, and then thegear slipped bacl: so that the pin 106 will engage within the slot 107with the gear overlying the ends oi": the pin. After the gear 83 hasbeen as seinblcd on the reel-shatt- 36, roller 108 cenbe placed behindit end the crank-rod. 109 placed in its bearings 110 and 111, on an endmember or frame standard of the frame, with the eccentric crank 112engaged ina central hole in the autii riction roller 108. The cranlerod109 isprovided with a stop-pin 113 which projects from one side thereofto contact with shoulders on the bearing 110 to limit the rotation ofthe crankrod to 211 are of 180 degrees. As the stop-pin 1123 is locatedbelow the upper part of the hearing 110, it serves to hold the entitritiou roller 108 and the crank-rod 109 assembled together and, properlyasenibicifl with the lawn .mower. as the antiii t lion roller 108 isshove and can rest upon the reel-shaft ll hcri. the crank-rod 109 turnedto the 1 shown by l l t} of the drawings. the zinti'l'riction roller 108will press against the. gear 83 and force the gear 83 and the reelshei t36 to the left. compressing spring; 103, and the friction-cup 99 from fictional engagement with the frictionring so that rotation of the gear35 will I and a sharpening stone or tool can be pla 4. nvoxzpm notrotate the reel-shaft Reterring now,- to Free. 1 and 6. of the drawings,the cotterpin b can oc 10mm on 101.1 the 10..e o in "ie snorn roz; onone so ear 1 movec in o (l l t 1 lt 21 l t mesh with the gear- Thecotter-pin 88 may then be placed 1n the hole 8? 1n the other end of theshort rod 82, behind the collar 76, and. the driving gear connectionswill. be such that the roel-shatt 86 Will. be rotated by the motor thereverse dr. i 1

in position to be contacted by the reel-knives to sharpen them. 7

The hand-grip 11 1 is composed or" parts 115 and 116. The roclci V shaft1171's journaled i the part 115 and the part 11-6 is secured to thecrank secured to the rocking-shaft 117, so that the part of thehand-grip designated as the part 116 is, in ell'ect, a continuation. ofthe crank 118. The hand-grip 11 1 may be made of wood and the part 116separated from the part 115 by a bevel saw-cut 119, for example, so thatthere will be a positive stop for the part 116 when moved into line withthe part 115. The rocking .ihatt 11'? is provided witlix an extension120 journaled in a bracket and the rockingshatt and its extension areconnected. by a sleeve 122 which may be connected with the rockingrhattand its 'enten sion by cotter-pins 123 and 12 1 passed through suitableholes. 11. crank is secured to the side? sion 120 and is connected by arod 126 with a lever 12? which on with the clutch-rod 62. The lever 127is 1 lustrated by the drawings as provided with ahole through which thecluteh rod 62 extends and pins 128 and 129 are positioned in theclutch-rod 62 on oppositesides of the lever 127. The lever 127 ispivoted on a stud 130 on the base 1. The end 131 of the rod is bentparallel with the extension 120 oi -the rocking-shaft 117 and possessthrough a hole in the crank 125 so that longitudinal move ments of therocking-Limit 117' will not feet the position of the clutch-rod 62. Aspring; 132 is interposed between the crank 1 and the bracket 121 and aspring 133 is interposed between the bracket 121 and the sleeve Thesesprin are of the open J J. compression type and constitute resih meanstor n.e'."e2'1t1n r was, from the machine being: transmitted to hand-Q114i. and

L1 .l 1 permit small movements ot tle handgun 111 to avoid tiring; theoperator. The ham die-rots 3 1 and are ri idly secured to the )art 11501: the. 1nd... JD 1141 and n) l pivotally connected, in line vith eachother, with the traine standards, so as to turn about K ll:

a common axis when turned up in a manner.

7 of. the handle-rods 134 and 135 and forms a The frame of the lawnmower has been re- 7 terred to hereinbetore generally and its mainmember the so-called base 4: which is the upper crc 2; member of theframe to which the motor is secured and in which the shaft (7 isournaled. An end member or frame s secured to one end 01 the baseieinber or frame standard 136 the opposite end of the base 4 d 138. Across-bar 139, to which the lroite 26 is secured, and which isa'cljustalflle by -crews, n. 1 shown, is secured to the end members orframe standards by bolts one of which, 1 .10 is'clearly shown by i' igs.1 and .2 of the drawings. The rear extensions and 21 are provided withslotted uprights which are adjustable up or down grooves in the endineilbers or frame :dards 136 and 38, respectively, and are reinadjusted positions by shouldered bolts 1 1 and 142 over which areslipped the ends of the l1andle-rods 135 and 13st, respeotively, pins143 and 14 1 retaining the handle-rods on the bolts. I Thereferencenumeral 1 15 designates an aperture in the gear cover 39 largeenough or the removal of the bolt 101 and this aperuro may be covered bya plate 1-16 secured o the gear cover 39 by screws, clearly uhown byFig. 6 ot the drawir The gear cover is also provided with a pri'fiection1 see Fig. ot the drawings, to prevent from being displaced when the.l-sf t 36 has been withdrawn. v

rotatzzable ring 118 is mounted on the' is secured to .v bolts 13? ined.1 designates a c the drawings a1 cover 39 and any cimsiderable 1.carried e reference serial n which i as an integgr is intended thedrawings and when considered in COl'lHQolllOll with the following des:iption; I

.Vhen the motor 1 15 in operation, or running, it will rotate thecrank-shaft 12 in the direction indicated by the arrows on the drawingsand, with the parts in the positions shown by Figs. 1, 2, 3, 4 and 5 ofthe draw ings, the pinion 33 will rotate the gear 34 and the gear 34-will rotate the ground-wheels 2 and 3, in a direction to propel the lawnmower forward, through the friction-clutch mechanism (including thefriction-ring i5 and the friction-cup 4-8), the positive clutchmechanism (including the clutch-member 512 and the facing-clutch-member58), the. pinion 54, the diiferential-mechanism (including themaster-gear 66, the bevel-pinions 70, and the bevel-gears (39 and 71),the shaft 6"? and the key 77 which lreys the ground-wheel 3 to the shaft67. 'l. he gear 3% will also retate the reel-shaft SS, and the reellmives 3 carried thereby, in the same direction as the gronndwheels 2and 3, but faster in proportion to the gear ratios, through the gear andthe friction-clutch mechanism (including the friction-ring 95 and thefrictioncup 99).

When the lawn mower is turne the differential mechanism will permit adili'erential rotation of the groundovheels 2 and z) to avoid injury tothe sod.

If an obstruction, a stick for example, is caught between a reel-knife37 and the fixedknife 26, the rotation of the reel-shaft and thereel-knives 3'? will be stopped without causing damage or breakage,because the friction-ring 95 can slip on the friction-cup 99, the spring103 being weak enough to 3ermit such slip under the condition stated.

The friction-clutch mechanism (including the friction-ring 45 and thefriction-cup 48) which transmits the power from the gear 3&- to theground-wheels 2 and 3, is primarily intended for use when the lawn moverruns into long grass, for example, and it is desired to reduce the speedof progression of the lawn mower while ymrmitting the reel-shaft 36 andthe reel-lain 'es ill to be rotatea at full speed. By holding back onthe hand-grip 11.4, the speed oi progression of the lawn mower can bedecreased because the frictionring 45 can then slip on the friction-cupto, the springs 49 being weak enough to permit such slip under suchcircumstances.

hen the frictioircup i8 is released from frictional engagement with thefriction-ring 45 by moving the part 116 of the hand-grip 114, the gear34; cannot rotate the groundwhoels 2 and 3 but the reel-shaft 36 and thereel-knives 37 can still. be rotated bythe motor. The lawn mower canthen be propelled forward or baclzwa rd by hand. i The purpose of thepositive clutch (includin 'theclutch-melaber and thefaoing-olutch-n'iember is t leave the pinion 54 entirely free to bemoved, or rotated by the master-gear 66 when the friction-cup 43.8 hasbeen freed from contact with the friction-ring 45, as it will be readilyseen that if the pinion 54 were not freed from the friction-cup 4:8, andthe lawn mover were to be moved, the ground-wheels 2 and 3 would have todrive the pinion 5a with the friction load produced by the springs 49pressing the hub 43 of the spider 412 against the end member or framestandard 38. With the construction illustrated and described, the pinion54L can be rotated easily by the ground-wheels when the springs 49 arecompressed to disengage both the friction-clutch mechanism and thepositive clutch mechanism.

The crank-rod 109 can be turned to the position shown by Fig. (5 of thedrawings to disengage the friction-cup 95) from the frictionring 95 toprevent rotation. of the reel-shalt 36 and the llUl-liillVQS by the gear2:35, but the primary advantage derived from this construction is thatthe gear 81 can be moved into mesh with the gear 8;} so tl'iatthe motorwill rotate the reel-shaft 3b and the reellrnives 37 in the reversedirection so that the reel-knives 3'? can be contacted with a sharpeningstone or implement for sharoening them.

By removing the cotter-pins 123 and 124:, ie sleeve 122 can he slippedup on the rocking-shaft 117 so as to clear the extension 120 and thehandle-rods and 135, with the l'iand-grip 11a and the rocking-shaft11'4", can be swun up rdly to diminish the space re quired for the lawnmower when not in use.

The reel-shaft 36, with the reel-knives 3? thereon, is readily removedin the following manner without excessive disassembling of the lawnmower. The ground-wheel is first removed by first removing the pin andthe cap 74. The'plat-e 146 being thus exposed, it is ren'ioved, exposingthe belt 101 which. is then removed. The ground-wheel 3 is then removed,with the gear 81 and the collar The bolts 1.31 138 and 1430, see Fig. 2of the drawings, are then removed wliich free the trame standard 12.36from the other parts of the free e. The cotter-p n i is removed from thebolt 14-! and the handle-rod 1535 slipped oiii from said bolt. Theremoval of the frame standard ll-lli -ermits the reel-shalt 36, with thereel-knives 3i thereon, to be re moved with it, or the crank-rod 109,the pin 106 and gear 83 can be removed prior to the removal of the framestandard 136, then the frame standard 136 can be removed, and

lastly the reel-shaft 36. The projection i l-H prevents displacement ofthe gear 35, the friction-cup 99 and the bushing 91, so that these partsretain their proper positions for the re'assembling ot the samereel-shaft or a duplicate one.

W hat is claimed is:

1. In a lawn mower, the combination of a frame, a motor supported bysaid frame and having a crank shaft journaled therein, wheels rota-tablysupported by said frame at each side thereof, a blade member rotatablysupported by said frame intermediate said wheels, a driving connectionbetween said shaft and said blade. member, a differential transmissionmechanism carried by one and cooperating with both of said wheels for offecting rotation of the latter, and a clutch providing a drivingconnection between said shaft and said differential mechanism.

2. In a lawn mower, the combination of a frame, a motor supported bysaid frame and having a crank shaft journaled therein, wheels rotatablysupported by said frame at each side thereof, a blade member rotatablysupported by said frame intermedirte said wheels, a plurality of gearssupported in mesh, a differential transmission mechanism carried by oneand cooperating with both of said wheels for effecting rotation of thelat ter, means providing a driving connection between said gears andsaid shaft and a. clutch providing a driving connection betweensaiddifferential mechanism. and one of said gears.

3. In a lawn mower, the combination of a frame, a motor supported bysaid frame and having a crank shaft journaled therein, wheels rotatablysupported by said frame at each side thereof, a blade member rotatablysupported by said frame intermediate said wheels, a plurality of gearssupported in mesh, means providing a driving connection between saidgears and shaft, a differential transmission mechanism carried by oneand cooperating with both of said wheels for fecting rotation. of thelatter, a clutch providing a driving connection between saiddifferential mechanism and one of said gears, a second clutch providinga driving connection between said blade member and another of saidgears, and means for independently controlling said clutches.

4. In a lawn mower, the combination with a frame provided with wheels,blades rot: ably supported by said frame, and a motor secured to saidframe for operating said lilac and said wheels, of a clutch connected tosaid motor, differential gearing connecting said wheels, and a secondclutch providing a driving connection between said first-med tionedclutch and said differential. gearing.

5. In a lawn mower, the combination of a frame, a motor supported bysaid frame and having a crank shaft journaled therein, wheels rotatablysupported by said frame at each side thereof, a blade member rotatablysupported by said frame intermediate said wheels, a plurality of gearsarranged in mesh and supported between said shaft and said blade member,clutch means releasably con necting one of said gears to one of saidwheels, second clutch means releasably connecting another of said gearsto said blade member, and means providing a driving connection betweensaid shaft and said gears.

6; In a lawn mower, the combination of a frame, a motor supported bysaid frame and having a crank shaft journaled therein, wheels rotatablysupported by said frame at each side thereof, a blade member rotatablysupported by said frame intermediate said wheels, a plurality of gearsarranged in mesh and supported between said shaft and said blade member,clutch means releasably connecting one of said gears to one of saidwheels, second clutch means releasably connecting another of said gearsto said blade. member, means providing a driving connection between saidshaft and said gears, and means for independently controlling saidclutch means.

7. In a la. n mower, the combination with a frame provided with wheelsat each side thereof, a blade member supported by said frameintermediate said wheels, motor secured to said f nine, and a drivingconnection betwee said motor and said blade member, of differentialtransmission mechanism carried by one and cooperating with bot-h of 5 idwheels for effecting rotation thereof, and means connecting saiddifferential mechanism to said motor for operation thereby.

8. In a lawn mower, thecombination with a frame provided with wheels ateach side thereof, a blade member supported by said frame intermediatesaid wheels, and a motor secured to said frame, of a plurality of gearsarranged in mesh and supported between s id motor and said blade member,means providing anoperative connection between said gears'and saidmotor, a clutch cooperating with one of said gears and said wheels foroperatively connectin the latter tosaid motor, and a second clutchcooperating with another of said ge rs and said blade member foroperat-ively, connecting-the latter to said motor.

9. In a lawn mower, the combination with a frame provided with wheels ateach side thereof, a blade member supported by said frameintermediatesaid. wheels, a motor secured to said frame, of a pluralityof gears arranged in mesh and supported between said motor and saidblade member, means providing an operative connection between said gearsand said motor, a plurality of clutches cooperating with said gears forindependently connecting said wheels and said blade member to said motorfor operation thereby, and means for independently controlling saidclutches.

10. In a lawn mower, in combination, a

frame having end members, a motor supported by said frame and providedwith a crank shaft journaled in one of said end members, a wheelrotatably supported by each of said end members, a blade memberrotatably sup ported intermediate said wheels, and means carried by oneof said end members for connecting said blade member and said wheels tosaid shaft, said means comprising a plurality of gears supported inmesh, means mos providing a driving connection. between said gears andsaid shaft, differential transmission mechanism, a clutch releasablyconnecting one of said gears to said differential mecha-- nism, and asecond clutch releasaoly connect-- ing said blade member to another ofsaid in lawn mower, the combination with rams, a motor supported by saidframe, a lo member mounted in said r me, and means connecting said blademembe to said motor for rotation in a predetermined direction, of a gearsupported for rotation and for movement along its axis of notation, saidgear coacting with said means upon such movement and causing rotation ofsaid member in the opposite direction.

12. In a lawn mower; the combination with a frame having a sup aortingtraction. element, a motor sn iiported by said frame, a blade membersupported by said frame, a driving connection between said member andsaid motor, a clutch for operativcly connecting said element to saidmotor, and means for controlling said clutch of a handle comprisingplurality of pa ts connected pivotal movem nt with re a l f spect toeach other about an axis extending longitudinally of said mower, and aconnection between said means and one of said parts whereby said cln maybe applied and released by cl'ianging the angular relation between saidparts.

13. In a machine of the character de scribed the combination with theframe and opera mechanism therefor, and the means for controlling saidmechanism, of means connected to said frame for guiding said machine andincluding a hand-grip comprising two oppositely-directed parts and meanspivotally connecting the latter for permitting movement of the intoalignn'icnt i i 1 other and movement of the same out of a lgnment witl'ieach other, and means one of said parts to said eonmeans whereby thelatter is moved its respective driving and non-drivin positions uponsuch relative movements of id parts.

lei. in a machine of the character described, the combination with theframe and operatin mechanism therefor, and the means for controllingsaid mechanism, of means connected to said frame for guiding saidmachine and including hand-grip comprising two oppositely-directed partsand means pivotally connecting the latter for permitting movement of thesome into alignment with -ch other and movement of the same out of alinment with each other, and means connecting one of saic parts to saidcontrolling means whereby the latter is moved to its respective drivingand non-driving positions upon such relative movements of said parts,the adjacent ends of said parts being cut on a bevel providing a stoplimiting said firstnamed movement of said parts when the latter inalignment with each other.

in a machine of the character described, the combination with the frameand operating mechanism therefor, and the means ntrolling saidmechanism, of a handg a pair of "earwardly and upwardly extending "edsspaced and connected at their lower e. to said frame for pivotal moveacommon axis, said rods con verging upwardly and being connected at theirupper ends to said hand-grip, a reardly and upwardly extending shaft anirly disposed with respect to said rods 1 end journaled in and andcaving its lower held relative axial movement with res d frame, theupper end of said soa' curnalod in said hand-grip and relative axialmovement with ereto whereby said shaft may be m; its longitudinal axisand acts iii" LE; gro connected thereto in a predetermined with respectto said frame, means id controlling means to said Hrcof, and means forcausing said movement of said shaft.

iii. in a machine of the character de scribed he combination with theframe and mechanism therefor, and the means oiling said mechanism, of arear- 5 id upwardly (intending shaft havs lower end. journaled in saidframe for Q movement about its longitudinal s, means supporting theupper end of said shaft and holding the latter against movement laterawith respect to said frame while poi-mi ng said rocking movement of thesome, spring means coacting with said fr: e and the lower end of saidfor yiel inglv holding the latter against relative are movement withrespect to said frame, means connecting aid controlling means to saidsiiaft for actuation. there roclti movement thereof, and means for myupon said causi d reciting movement of said shaft. 17, in a lav-:nmower, the combination with a frame, a motor supported by said frame, ablade member rotatably mounted in said frame, driving connection betweenALBERT J. DREMEL.

